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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b67c636369c80625cbea34aca933fc8ef17a98a5b05f03a61af24a10d7990c' 
  AND token = 'p3kNtOT0OiCz6f/rfrQoXO4xHiZVi+tAaP4KQ4xBARY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}